Package org.lwjgl.opencl

Source Code of org.lwjgl.opencl.InfoUtilAbstract

/*
* Copyright (c) 2002-2010 LWJGL Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
*   notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
*   notice, this list of conditions and the following disclaimer in the
*   documentation and/or other materials provided with the distribution.
*
* * Neither the name of 'LWJGL' nor the names of
*   its contributors may be used to endorse or promote products derived
*   from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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package org.lwjgl.opencl;

import org.lwjgl.LWJGLUtil;
import org.lwjgl.PointerBuffer;

import java.nio.ByteBuffer;

import static org.lwjgl.opencl.CL10.*;

/**
* Base implementation of information utility classes.
*
* @author Spasi
*/
abstract class InfoUtilAbstract<T extends CLObject> implements InfoUtil<T> {

  protected InfoUtilAbstract() {
  }

  protected abstract int getInfo(T object, int param_name, ByteBuffer param_value, PointerBuffer param_value_size_ret);

  // Optional

  protected int getInfoSizeArraySize(final T object, final int param_name) {
    throw new UnsupportedOperationException();
  }

  protected PointerBuffer getSizesBuffer(final T object, final int param_name) {
    final int size = getInfoSizeArraySize(object, param_name);

    final PointerBuffer buffer = APIUtil.getBufferPointer(size);
    buffer.limit(size);

    getInfo(object, param_name, buffer.getBuffer(), null);

    return buffer;
  }

  public int getInfoInt(final T object, final int param_name) {
    object.checkValid();

    final ByteBuffer buffer = APIUtil.getBufferByte(4);
    getInfo(object, param_name, buffer, null);

    return buffer.getInt(0);
  }

  public long getInfoSize(final T object, final int param_name) {
    object.checkValid();

    final PointerBuffer buffer = APIUtil.getBufferPointer();
    getInfo(object, param_name, buffer.getBuffer(), null);

    return buffer.get(0);
  }

  public long[] getInfoSizeArray(final T object, final int param_name) {
    object.checkValid();

    final int size = getInfoSizeArraySize(object, param_name);
    final PointerBuffer buffer = APIUtil.getBufferPointer(size);

    getInfo(object, param_name, buffer.getBuffer(), null);

    final long[] array = new long[size];
    for ( int i = 0; i < size; i++ )
      array[i] = buffer.get(i);

    return array;
  }

  public long getInfoLong(final T object, final int param_name) {
    object.checkValid();

    final ByteBuffer buffer = APIUtil.getBufferByte(8);
    getInfo(object, param_name, buffer, null);

    return buffer.getLong(0);
  }

  public String getInfoString(final T object, final int param_name) {
    object.checkValid();

    final int bytes = getSizeRet(object, param_name);
    if ( bytes <= 1 )
      return null;

    final ByteBuffer buffer = APIUtil.getBufferByte(bytes);
    getInfo(object, param_name, buffer, null);

    buffer.limit(bytes - 1); // Exclude null-termination
    return APIUtil.getString(buffer);
  }

  protected final int getSizeRet(final T object, final int param_name) {
    final PointerBuffer bytes = APIUtil.getBufferPointer();
    final int errcode = getInfo(object, param_name, null, bytes);
    if ( errcode != CL_SUCCESS )
      throw new IllegalArgumentException("Invalid parameter specified: " + LWJGLUtil.toHexString(param_name));

    return (int)bytes.get(0);
  }

}
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